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I mistakenly entered an old email id for my apple ID and cannot verify since i don't have credentials to that account. i can't verify the email address and so cant sign off as well from my device
See Get a verification code and sign in with two-factor authentication https://support.apple.com/en-us/HT204974 Below is an excerpt, but read the whole document. See the bold italics below.
Whenever you sign in with your Apple ID on a new device or browser, you'll confirm your identity with your password plus a six-digit verification code. There are a few ways you can get a verification code. You can use the code displayed on your trusted device, get a text or phone call, or generate a code from your trusted device [see the additional information in the article].
A trusted device is an iPhone, iPad, or iPod Touch with iOS 9 and later or a Mac with OS X El Capitan and later that you've already signed into using two-factor authentication.
If you can’t sign in, reset your password, or receive verification codes, you can request account recovery to regain access to your account. This link takes you to:
Recover your Apple ID when you can’t reset your password https://support.apple.com/en-us/HT204921 which you may need to use.
“Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity. After you request account recovery, you'll get an email with a confirmation of your request and the date and time of when you can expect to regain access. … When the wait period is over, Apple sends you a text or automated phone call with instructions to regain access to your account.” Read the whole document carefully.
See Get a verification code and sign in with two-factor authentication https://support.apple.com/en-us/HT204974 Below is an excerpt, but read the whole document. See the bold italics below.
Whenever you sign in with your Apple ID on a new device or browser, you'll confirm your identity with your password plus a six-digit verification code. There are a few ways you can get a verification code. You can use the code displayed on your trusted device, get a text or phone call, or generate a code from your trusted device [see the additional information in the article].
A trusted device is an iPhone, iPad, or iPod Touch with iOS 9 and later or a Mac with OS X El Capitan and later that you've already signed into using two-factor authentication.
If you can’t sign in, reset your password, or receive verification codes, you can request account recovery to regain access to your account. This link takes you to:
Recover your Apple ID when you can’t reset your password https://support.apple.com/en-us/HT204921 which you may need to use.
“Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity. After you request account recovery, you'll get an email with a confirmation of your request and the date and time of when you can expect to regain access. … When the wait period is over, Apple sends you a text or automated phone call with instructions to regain access to your account.” Read the whole document carefully.
contact Apple ID Support for assistance. I would have a copy of the original purchase receipt with the serial number on it available when you contact them. See the Apple Support articles below for contact information.
Apple ID - Official Apple Support.
Contact Apple for help with Apple ID account security - Apple Support. (Link doesn’t always load)
Get Support Work through the screens to get a chat option. You may have to pick a slightly different problem.
Apple Support schedule phone call
https://twitter.com/AppleSupport. People have posted it may take an hour or more to get a response.
I mistakenly entered an old email id for my apple ID and cannot verify since i don't have credentials to that account
